Table T4. Calcareous nannofossil biostratigraphic marker species observed in Leg 170 and 205 core samples.
Index fossil
Age
(Ma)
B Emiliania huxleyi 0.26
T Triquetrorhabdulus rugosus 0.46
T Helicosphaera sellii 1.47
T Discoaster brouwerii 1.95
T Discoaster pentaradiatus 2.55
T Reticulofenestra pseudoumbilicus 3.75
T Sphenolithus abies/neoabies 3.75
T Triquetrorhabdulus rugosus 5.34
T Discoaster quinqueramus 5.60
T Discoaster loeblichii 7.40
B Discoaster berggrenii 8.60
B Discoaster loeblichii 8.70
T Discoaster hamatus 9.40
B Discoaster hamatus 10.70
T Coccolithus miopelagicus 10.80
T Discoaster kugleri 11.50
B Discoaster kugleri 11.80
T Cyclicargolithus floridanus 11.80
T Sphenolithus heteromorphus 13.60
T Helicosphaera ampliaperta 15.60
B Sphenolithus heteromorphus 18.20

Note: Datums and ages are from Berggren et al. (1995a, 1995b).